Fixing a Kenwood KD 491F turntable

The reason why the audio is low, is that todays receivers do not have a phono input, and these types of inputs are differant then the ones of today. You will need whats called a phono preamp, and one should still be available from Radio shack. Or you can go here to find out more about them: http://www.phonopreamps.com/
To reseat the belt, take off the rubber mat on the turntabe disc. Install the belt around the inside ridge, there should be a couple of holes on the platter disc. Install the patter back onto the center spindle. Turn the platter around till you see the motor pully through one of the holes in the platter. Take the belt that is around the turntable platter, and pull it over to the motor pulley. Good Luck